But what is the anti-particle of a; -Neutron -Electron?

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I know the anti-particle of a proton is a positron.

But what is the anti-particle of a;

-Neutron
-Electron?
 
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Unfortunately, the antiparticle of a proton is NOT a positron. It's an antiproton. The positron is the antimatter counterpart of the electron. Except for the electron, the antimatter counterparts of most particles are simply denoted as anti(name of particle). For instance, the antiparticle of a neutron is simply the antineutron.